"Modern Masters 2017 Edition", +m/can't\s(activate\s|be\sactivated|.*or\sactivate\s)/, +!"to cast spells or activate abilities" (4)
Enchant creature
Enchanted creature can't attack or block, and its activated abilities can't be activated.
At the beginning of the end step, if enchanted creature's power is 4 or greater, destroy Arachnus Web.
Activated abilities of artifacts and creatures can't be activated unless they're mana abilities.
Flying
Activated abilities of creatures your opponents control can't be activated.
Activated abilities of artifacts can't be activated.
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